JP4364289B2 - Optical prism, lens frame and optical assembly - Google Patents

Description

  The present invention relates to an optical prism capable of attaching a lens frame having an image pickup element such as a CCD on the image surface side of an internal reflection optical prism having image-forming properties with high accuracy, and the optical prism and the optical prism and mirror. The present invention relates to an optical assembly of a frame.

  In the Japanese Patent Application No. Hei 9-172168, the applicant of the present invention is provided with at least three optical surfaces, and reflects the incident light from the incident surface suitable for the incidence of the light from the subject two or more times within the self. Using a decentered optical prism that bends the optical path and emits the light from the predetermined light exit surface as an output light to form an image of the subject, the subject is imaged using an image sensor such as a CCD disposed on the image surface. Proposed that. Japanese Patent Application No. 10-77272 also proposed that an imaging optical system is configured by using two such decentered optical prisms and images a subject in the same manner.

  In such an imaging apparatus, in order to capture a subject image with the expected resolving power as designed, it is necessary that the optical prism and the imaging element maintain a regular positional relationship with high accuracy. It is a remaining technical problem to ensure both accuracy and ease of manufacturing.

  On the other hand, in recent years, it has become common to manufacture optical prisms by injection molding. In this injection molding method, it is possible to cope with molded products having various shapes by using a slide mechanism.

  FIG. 33 is a schematic diagram for explaining a mold having the slide mechanism. The part (a) of the figure shows a state in which the slide mold part S protrudes into the cavity C of the mold, whereby the shape in the cavity C forms the shape of the product to be molded. Further, the part (b) of the figure shows a state in which the slide mold part S is retracted from the cavity C of the mold so that a molded product made of plastic or the like molded in the cavity C can be taken out from the mold. Is shown. Further, part (c) of the figure shows a state in which the positional relationship between the part (a) of the part (a) and the cavity C of the mold is viewed from another angle.

  By using a mold having such a slide mechanism, prisms having various shapes can be formed. Such a mold is known per se and can also be applied to mold the prism of the present invention.

  FIG. 34 is a schematic diagram for explaining a mechanism for moving a slide portion of a mold having a slide mechanism. In this mechanism, as the anguilla pin AP is relatively displaced from the state in which the anguilla pin AP is inserted into the through hole provided in the slide portion SL, the slide portion SL moves into the cavity C of the mold according to the inclination of the anguilla pin AP. It is made to displace so that it may retreat from.

  In FIG. 34 (a), the fixed mold FD and the movable mold MD are close to each other and the anguilla pin AP is inserted deeply into the through hole provided in the slide section SL, and the slide section SL is the mold. A state is shown in which a cavity internal shape corresponding to a molded product having a complicated shape protruding into the cavity C is formed.

The part (b) in FIG. 6 is relatively displaced in the direction in which the fixed mold FD and the movable mold MD are separated from each other, and accordingly, the anguilla pin AP is removed from the through hole provided in the slide section SL. As a result of moving so as to come out, the slide portion SL is retracted from the inside of the mold cavity C according to the inclination of the anguilla pin AP, and finally shows a state in which it comes out of the inside of the mold cavity C.

  After the state shown in FIG. 6C reaches the state shown in FIG. 5B, the ejector pin EP is displaced and the molded product MM in which the undercut portion UC is formed by the slide portion SL is taken out. Show.

  If the injection molding method using the slide mechanism as described above is used, optical prisms having various shapes can be manufactured relatively easily and efficiently.

  The present invention has been made in view of such a situation, and an object of the present invention is to apply an internal reflection decentered optical prism having an imaging property as an imaging element such as an electronic camera or an electronic endoscope. An optical prism capable of ensuring both positioning accuracy with the image pickup device and at the same time achieving ease of manufacture, a lens frame applied to the optical prism, and an optical device including the optical prism and the lens frame It is to provide an assembly.

  The optical prism of the present invention that achieves the above object comprises at least three optical surfaces, and bends the optical path by reflecting the incident light from the incident surface suitable for the incident light from the subject twice or more inside itself. An optical prism configured to emit light as emitted light from a predetermined emission surface to form an image of a subject on an imaging surface disposed outside, at least of the incident surface or the emission surface In an optical prism composed of an optical surface, one of which performs a transmission function and an internal reflection function, the optical prism is used in combination with a lens frame configured to be adapted to the self, and the incident surface and the output surface. A convex portion for attaching the optical prism to the lens frame is formed on a side surface formed in a direction crossing each direction.

  Another optical prism according to the present invention includes at least three optical surfaces, bends an optical path by reflecting incident light from an incident surface suitable for incidence of light from a subject twice or more inside itself, and determines a predetermined optical path. An optical prism configured to emit the light from the light exit surface to the outside as an output light and form an image of the subject on an imaging surface disposed outside, wherein at least one of the incident surface or the exit surface is In an optical prism composed of an optical surface that performs a transmission action and an internal reflection action, the optical prism is used in combination with a lens frame configured to be adapted to the self, and includes an entrance surface and an exit surface. A concave portion is formed on a side surface formed in a direction intersecting with each direction so as not to disturb an optical path within an effective diameter from the incident surface to the emission surface. Is shall.

  Still another optical prism according to the present invention includes at least three optical surfaces, bends an optical path by reflecting incident light from an incident surface adapted to incident light from a subject twice or more inside itself, An optical prism configured to emit light as emitted light from a predetermined emission surface to form an image of a subject on an imaging surface disposed outside, and includes at least one of the incident surface and the emission surface In the optical prism composed of an optical surface that performs a transmission action and an internal reflection action, a lens frame or an imaging element mounting member is integrally formed outside the effective area of the emission surface.

  In the present invention, it is possible to simplify the mounting operation of the lens frame and the image sensor that are compatible with the optical prism by using the convex part, the concave part or the lens frame or the image sensor mounting member, and to improve the alignment accuracy. It becomes.

  The present invention includes a lens frame attached to such an optical prism, a combination of such an optical prism and its lens frame and an image pickup device, and an optical assembly formed by a combination of such optical prisms.

  According to the present invention, when an internal reflection optical prism is used as an image forming optical system of an apparatus using an image forming optical system such as a camera or an endoscope, an image pickup device such as a CCD disposed on the image surface is provided. It is possible to provide an optical prism, a lens frame, and an optical assembly that can attach the lens frame to the optical prism with high accuracy while ensuring positioning accuracy with a simple mechanism. In addition, this type of optical prism that can achieve both manufacturing ease while ensuring positioning accuracy with respect to the image sensor, a lens frame applied to the optical prism, and the optical prism and the lens frame are provided. An assembly comprising the same can be provided.

  Hereinafter, the present invention will be clarified by describing embodiments of the optical prism, the lens frame, and the optical assembly of the present invention in detail with reference to the drawings.

  The embodiment of FIGS. 1 to 12 is an example using an optical prism 100 as shown as an imaging optical prism 100 in FIG. 1B, for example, and this optical prism 100 has three optical working surfaces 12. , 13, and 14, and the surface 14 is a surface on which a light beam from an object (subject) enters the optical prism 100, and the incident light beam is first internally reflected by the reflecting surface 13, and the reflected light 2 is an incident surface / reflecting surface 14 that also serves as a second internal reflection surface, and the surface 13 is the first reflecting surface that internally reflects light incident from the incident surface / reflecting surface 14 toward the surface 14. The surface 12 refracts the light beam that has been reflected for the second time by the incident surface / reflecting surface 14 and emits the light to the outside of the optical prism 100 to form an image of the object on the imaging surface 21 of the imaging element 22. An exit surface 12 to be imaged. The three surfaces 12, 13, and 14 are free-form surfaces, spherical surfaces, aspheric surfaces, anamorphic surfaces, or the like so that the optical prism 100 has a positive power (refractive power: reciprocal of focal length). It is comprised from the curved surface. It is desirable that at least one of the surfaces is composed of a plane-symmetry free-form surface having a single symmetry surface that gives power to the light flux and corrects decentration aberrations.

  FIG. 1 is a view showing the outer shape of an imaging optical prism as one embodiment of the present invention. 1 is a two-reflection optical prism in which a light beam from an incident surface is reflected twice and emitted from the inside. However, the present invention is not limited to this technical idea. The present invention extends to a three-reflection type imaging optical prism that reflects and emits light.

  In FIG. 1, the (a) part is a perspective view of the optical prism as the present embodiment and a mirror frame corresponding to the optical prism as seen from the oblique rear upper part, and the (b) part is the mirror described above. A side sectional view of an optical assembly formed by combining a frame and the optical prism, and part (c) of the figure is a partially cutaway view of the optical assembly as seen from the line of sight from the incident surface side.

  In particular, in the part (b) of the figure, the traveling path of the light beam in the optical prism is indicated by a broken line.

In the figure, the imaging optical prism 100 includes three optical action surfaces 12, 13, and 14. One surface 14 is a light beam from an object (subject) in at least a part of the common area of the surface. Functions as a surface incident on the inside of the optical prism 100, and the incident light beam is first reflected by the reflection surface 13, and also functions as a surface that reflects the second reflection of the reflected light by the total reflection action. This is the incident surface / reflecting surface 14. The curved surface 13 on the back side of the optical prism 100 is the first reflecting surface 13 that reflects the light incident from the entrance / reflecting surface 14 to the surface 14 side. Further, the surface indicated by the reference numeral 12 connected above the incident surface / reflecting surface 14 and the reflecting surface 13 with a ridge line as a boundary refracts the light beam reflected by the incident surface / reflecting surface 14 for the second time, and thus is optical prism 100. This is an emission surface (imaging device facing surface) 12 that forms an image of an object on an imaging surface 21 of an imaging device 22 such as a CCD provided in the lens frame 30. The exit surface 12, the reflection surface 13, and the entrance / reflection surface 14 are free-form surfaces or curved surfaces such as spherical surfaces, aspheric surfaces, and anamorphic surfaces so as to satisfy required optical characteristics. In the figure, a low-pass filter 20 for preventing moire fringes and the like is disposed between the emission surface (imaging device facing surface) 12 and the imaging surface 21 of the imaging device 22.

  The light from the object serves as the incident surface on the left side surface 60L and the right side surface 60R formed in the direction intersecting with each direction of the exit surface (imaging element facing surface) 12, the incident surface / reflecting surface 14, and the reflecting surface 13. Recesses 70L and 70R are formed so as not to disturb the optical path within the effective diameter from the reflection surface 14 to the emission surface 12. Here, the inside of the effective diameter is in an area ED surrounded by a two-dot chain line shown in FIG.

  In the example of FIG. 1, the side surfaces 60L and 60R of the block portion on the upper side of the optical prism 100 in which the front and rear surfaces are constituted by the incident surface / reflecting surface 14 and the imaging element facing surface 12 by the left and right step portions 80L and 80R. The concave portion 70L, the width of the gap is narrower than the width between the side surfaces 60L, 60R of the block portion on the lower side of the optical prism 100 in which the front and rear surfaces are constituted by the incident surface / reflecting surface 14 and the reflecting surface 13. 70R is molded, but this part is formed by a slide mechanism of an injection mold, and the effective inner diameter region ED surrounded by the two-dot chain line is 0.5 to 5.0 millimeters from this part. Set backwards inward. For this reason, according to the present embodiment, the distortion of the effective area of the optical prism due to the movement of the slide mechanism according to the injection molding method is minimized, and there is no possibility of deteriorating the performance of the portion using the optical characteristics.

  Left and right convex portions 90L and 90R for attaching the optical prism 100 to the lens frame 30 so as to protrude outward from the level positions of the step portions 80L and 80R of the left side surface 60L and the right side surface 60R, respectively. Is provided. In the present embodiment, the left and right convex portions 90L and 90R are molded using a slide mechanism applied to an injection molding method in molding the optical prism 100. Corresponding to the convex portions 90L and 90R on the optical prism 100 side, the lens frame 30 is also provided with left and right convex portions 31L and 31R (not visible in the drawing), and the convex portions 90L on the optical prism 100 side. , 90R and the projections 31L and 31R on the side of the lens frame 30 are combined to combine the optical prism 100 and the lens frame 30. Further, left and right bosses 91L and 91R for positioning with the lens frame 30 are provided at portions facing the outer convex portions 90L and 90R on the left and right step portions 80L and 80R.

  By fitting the bosses 91L and 91R and the corresponding concave portions provided on the lens frame 30 side, the alignment accuracy between the optical prism 100 and the lens frame 30 can be improved.

  As understood from the part (c) of FIG. 1 and the like, the mounting portion of the lower end of the lens frame 30 to the optical prism 100 is a stepped portion formed by the recesses 70L and 70R or the left and right stepped portions 80L and 80R. It has a shape corresponding to For this reason, it is easy to ensure the mounting accuracy of the optical prism 100 with respect to the lens frame 30.

  In FIG. L. A symbolic line indicates a mold dividing line (parting line) when the optical prism 100 is molded by an injection molding method.

  According to the embodiment, the portion outside the region where the optical characteristics are effectively used can be minimized, and the optical prism can be miniaturized to the limit.

  FIG. 2 is a view showing a modification of the embodiment described with reference to FIG. 1. FIG. 2A shows an optical assembly in which an optical prism 100-1 and a lens frame 30-1 are assembled. FIG. 4B is a perspective view of the optical assembly of FIG. In FIG. 2, the corresponding parts to those in FIG.

  In the example of FIG. 2, an inclination angle with respect to the horizontal that can be used for attaching a predetermined member to the convex portion 90 </ b> L- 1 (90 </ b> R- 1 cannot be seen in FIG. 2) formed using the slide mechanism as described above. A plurality of adjacent mounting surfaces 90L-1a and 90L-1b (90R-1a and 90R-1b are not visible in FIG. 2) are formed. Also, the left and right step portions 80L-1 (80R-1 cannot be seen in FIG. 2) corresponding to the left and right step portions 80L and 80R in the form of FIG. A plurality of mounting surfaces 80L-1a and 80L-1b (80R-1a and 80R-1b are not visible in FIG. 2) are formed.

  According to the said form, while using a some attachment surface for attachment of a various related member, while being able to ensure the positional accuracy of attachment, it is a function combined with this optical prism 100-1 as needed. Can be given.

  For example, in the example of FIG. 2, the printed wiring board 200 on which electronic components are mounted is secured to the mounting surface accuracy (inclination angle, etc.) using the second mounting surface 90L-1b (90R-1b). The mounting screws 200a can be used for proper mounting. At the same time, the lens frame 30-1 can be stably attached using the first attachment surface 90L-1a (90R-1a) while ensuring the positional accuracy of the attachment.

  FIG. 3 is a view showing another modification of the optical prism described with reference to FIG. 1. FIG. 3 (a) is a side view of the optical prism 100-2, and FIG. 3 (b). FIG. 3 is a perspective view of the optical prism of FIG. In FIG. 3, the same reference numerals are assigned to the corresponding parts in FIGS. 1 and 2 described above.

  In the example of FIG. 3, an inclination with respect to the horizontal that can be used for attaching predetermined members to the above-described left and right convex portions 90L-1 and 90R-1 that are molded using a slide mechanism when manufactured by an injection molding method. A plurality of mounting surfaces 90L-1a, 90L-1b and 90R-1a, 90R-1b which are adjacent at different angles are formed. Also, the left and right step portions 80L-1 (80R-1 is not visible in FIG. 3) corresponding to the left and right step portions 80L and 80R in the form of FIG. A plurality of mounting surfaces 80L-1a and 80L-1b (80R-1a and 80R-1b are not visible in FIG. 3) are formed.

  In particular, in the embodiment of FIG. 3, the cavity number 90ca of the mold used for manufacturing the optical prism is imprinted on a predetermined surface (for example, 90L-1b) among the plurality of surfaces.

  According to the above aspect, since the cavity number of the mold used for manufacturing the optical prism 100-2 is engraved using a predetermined one of the plurality of surfaces, the manufacturing and quality control History management of optical prisms becomes easy.

  FIG. 4 is a perspective view of an optical prism 100-3 as another modified example of the optical prism described with reference to FIG. In FIG. 4, the same reference numerals are given to the corresponding parts in FIGS. 1, 2 and 3 described above.

  In the example of FIG. 4, parallel to the front-rear direction at the same level position as the upper surfaces of the left and right convex portions 90L-3 and 90R-3 formed by using a slide mechanism when manufactured by an injection molding method. The left and right surfaces 90L-3a and 90R-3a are provided so as to be extended, and recessed from each of the surfaces 90L-3a and 90R-3a to a predetermined depth (a depth corresponding to the thickness of the low-pass filter 20) in a step shape. The left and right surfaces 90L-3b and 90R-3b are formed so as to extend in parallel in the front-rear direction also at the positions.

  These left and right surfaces 90L-3b and 90R-3b are used as mounting surfaces of the low-pass filter 20.

  FIG. 5 is a perspective view of an optical prism 100-4 as still another modification of the optical prism described with reference to FIG. The thing of FIG. 5 resembles the thing of FIG. 4 already mentioned in many respects, but the thing of FIG. 4 was dented in one step | step shape about the part of the above-mentioned left and right surfaces 90L-3b and 90R-3b. In contrast to the shape, FIG. 5 is characterized in that a two-step stepped concave portion is provided.

  That is, in the example of FIG. 5, in the front-rear direction at the same level position as the upper surfaces of the left and right convex portions 90 </ b> L- 4, 90 </ b> R- 4 that are molded using the slide mechanism when manufactured by the injection molding method. The left and right surfaces 90L-4a and 90R-4a are provided so as to extend in parallel, and are recessed from the surfaces 90L-4a and 90R-4a to a predetermined depth (a depth corresponding to the thickness of the CCD 22) in a step shape. The left and right surfaces 90L-4b and 90R-4b are formed so as to be extended in parallel in the front-rear direction also at the positions. Further, from the left and right surfaces 90L-4b and 90R-4b at the positions where the recesses are stepped in one step, the recesses are stepped into a predetermined depth (a depth corresponding to the thickness of the low-pass filter 20 or a depth greater than that). The left and right surfaces 90L-4c and 90R-4c are formed so as to be extended in parallel in the front-rear direction also at the positions.

  The left and right surfaces 90L-4b and 90R-4b in the first stage are used as mounting surfaces for the CCD 22, and the left and right surfaces 90L-4c and 90R-4c in the second stage are used as mounting surfaces for the low-pass filter 20. It is done.

  According to the form of FIGS. 4 and 5, it is easy to attach the CCD 22 adapted to the optical prism, the low-pass filter 20, or other accessories such as other filters as required.

  FIG. 6 shows the parting line P. of the optical prism 100 described with reference to FIG. L. FIG. 4A is a side view of the optical prism 100, and FIG. 2B is a view of the optical prism 100 in FIG. It is a perspective view. In FIG. 6, the same reference numerals are assigned to the corresponding parts in FIG.

  As described above with reference to FIG. 1, the prism 100 is manufactured by an injection molding method, and the above-described imaging element facing surface 12 and the reflecting surface 13 are in contact with each other to form one ridge line E1. The incident surface / reflecting surface 14 and the reflecting surface 13 are in contact with each other to form another ridgeline E2. Needless to say, in the above description, the ridge line is not that in a mathematically strict definition, but refers to an edge portion constituted by two plane portions in the order of illustration. Hereinafter, the same general expression as described above will be described.

A mold dividing line PL3 for injection molding is set so as to be along a virtual plane that roughly includes the two ridge lines E1 and E2 that are not adjacent but are opposed to each other. As shown in the figure, the mold parting line PL3 is slightly extended so as to project forward in an arc shape from edges 13EL, 13ER on both sides of the reflecting surface 13 formed by contacting the reflecting surface 13 with the left and right side surfaces 60L, 60R. Formed apart.

  If the mold parting line PL3 is set as shown in FIG. 6, it is easy to set the mold parting line when the optical prism 100 is manufactured by the injection molding method.

  The mold parting line PL3 described with reference to FIG. L. However, in this example, this angle θ is selected to be a power represented by a natural number. For this reason, the measurement for confirming the precision of the metal mold | die concerning the said injection molding is easy, and, as a result, it is easy to ensure precision and manufacture is easy.

  FIG. 7 is a view for explaining the setting of the gate when the optical prism 100 described with reference to FIGS. 1 and 6 is manufactured by an injection molding method. FIG. 7A shows the optical prism 100 obliquely rearward. It is a perspective view desired from the upper part, and the same figure (b) section is a side view of optical prism 100 of the same figure (a) section. In FIG. 7, the same reference numerals are assigned to the corresponding parts in FIG.

  As shown in part (a) of FIG. 7, a gate for injecting a resin in the case of manufacturing by an injection molding method by appropriately separating vertically along the mold dividing line PL3 on the left side 60L. GT-L1 and protrusion overflow GT-L2 are provided, and the right side surface 60R is similarly provided with protrusion overflows GT-R1 and GT-R2 that are appropriately separated vertically along the mold parting line. Yes. When the gate GT-L1 on the left side 60L side and the overflow GT-L2 for protrusion are taken out from the mold as shown in the part (b) of the figure, the corresponding ejector pins EP-L1 and EP-L2 This is the same for the overflows GT-R1 and GT-R2 for protrusion on the right side surface 60R side. That is, the gate GT-L1 and the overflows GT-L2, GT-R1 and GT-R2 for ejection are used to project from the functional part and the mold for injecting the resin when manufactured by the injection molding method. Convex part (pressure receiving part) for receiving pressing force from ejector pin.

  In particular, each of the gates GT-L1 and the overflows GT-L2, GT-R1 and GT-R2 for ejection are respectively corresponding ejector pins EP-L1, EP-L2 and (not shown, EP-R1, EP-R2). Are formed at equidistant positions from the center of gravity related to the protruding force received from each other, and are formed so that their thickness dimensions are equal.

  According to the configuration described with reference to FIG. 7, since the protrusion from the mold is easily and reliably performed, the processing efficiency is improved when the optical prism is manufactured by the injection molding method.

  Furthermore, since the protruding protrusions (the gates GT-L1 and the protruding overflows GT-L2, GT-R1, and GT-R2) have the same thickness dimension, when they are finally cut off, Workability is improved because the shear stroke is uniform.

  FIG. 8 is a view showing still another modified example of the optical prism described with reference to FIG. 1. FIG. 8A is a perspective view of the optical prism 100-5 viewed from the upper oblique rear side. Part (b) is a side view of the optical prism 100-5 in the part (a) of the figure, and part (c) in the figure explains the optical characteristics of the optical prism 100-5 in the part (a). It is a conceptual diagram for. In FIG. 8, the same reference numerals are assigned to the corresponding parts to those in FIG.

The optical prism 100-5 in FIG. 8 is multi-coated over a predetermined range of the reflecting surface 13, that is, substantially the entire effective area utilizing optical characteristics, to form a coated area 13CD. Then, a satin processing is performed on a limited area above the coated area 13CD, and a satin processing is performed to prevent a ghost when taking an image of a subject using the optical prism 100-5. Region 13AV is formed. A coating allowance 13CDM having a predetermined width (for example, 1 mm or less) for appropriately performing the multi-coating process is provided at the boundary between the coated area 13CD and the textured area 13AV. Since there is a coating allowance of 13 CDM, multi-coating can be easily performed without performing a difficult process such as forming a film at a boundary portion between a specific surface and the optical surface.

  The pear treated area 13AV is set with a predetermined angle with respect to the coated area 13CD, constitutes an area defined differently from the coated area 13CD, and produces the above-described ghost prevention effect. ing.

  In the optical prism 100-5 having the above-described configuration, the light emitted from the subject O is reflected on the reflecting surface 13 as described with reference to the portion (c) in the figure, which is a conceptual diagram for explaining the optical characteristics. Reflected between the upper outermost ray line 13UBL, which is the boundary between the coated region 13CD and the pasty treatment region 13AV, and the lower outermost ray line 13LBL, which is the lower limit of the effective range of the region 13CD, Head to CCD22. At this time, the ghost light is prevented from entering the imaging surface 21 of the CCD 22 by the action of the pear ground processing region 13AV.

  FIG. 9 is a schematic diagram for explaining the characteristics of the optical prism described with reference to FIG. 1. FIG. 9A is a side view of the optical prism 100, and FIG. (A) The figure which looked at the optical prism 100 of the part from the upper part, the figure (c) part is the figure seen from the back side similarly, Furthermore, the figure (d) part is the figure seen from the lower surface side similarly. . In FIG. 9, the same reference numerals are assigned to the corresponding parts in FIG.

  As understood from FIG. 9, the optical surfaces such as the exit surface 12 and the reflection surface 13 and the entrance surface and the reflection surface 14 have ridge lines formed by two adjacent surfaces forming a curve (curvature). R) is formed as a curved surface. For this reason, the structure of the metal mold | die for manufacturing an optical prism with an injection molding method is easy. Furthermore, this optical prism is formed so that at least two opposing surfaces of the optical surfaces are substantially equal in the width direction intersecting the optical axis. It is easy to evaluate the quality as an optical prism.

  FIG. 10 is a view showing another form of the optical assembly described with reference to FIG. In FIG. 10, the same reference numerals are assigned to the corresponding parts in FIGS. 1 and 6 described above.

  The lens frame 30-2 in FIG. 10 supports the CCD as the image pickup device 22 and the low-pass filter 20 corresponding thereto as in the above-described case, and the lower skirt portion 30-21 is the optical prism 100-6. It is combined with the optical prism 100-6 so as to be fitted into the top of the exit surface 12 side.

  In the optical assembly of FIG. 10, a sealant 30SL is filled in a portion where the lower skirt portion 30-21 of the lens frame 30-2 is in contact with the top of the optical prism 100-6 on the inner surface side. In this example, the sealing agent 30SL is selected as a type in which an adhesive for joining the lens frame 30-2 and the optical prism 100-6 functions as the sealing agent 30SL. The adhesive exhibits such a property that reflection of light is suppressed as an attribute thereof.

  In the optical assembly shown in FIG. 10, it is easy to form a closed space on the exit surface 12 side of the optical prism 100-6, and the possibility that dust and the like adhere to the exit surface 12 side and the optical characteristics are hindered is reduced.

  In addition, since the adhesive, that is, the sealing agent 30SL exhibits such a characteristic that reflection of light is suppressed as an attribute, reflection on the incident surface 12 side of the optical prism 100-6 is suppressed.

  FIGS. 11A and 11B are views showing still another form of the optical assembly described with reference to FIGS. 1 and 10, wherein FIG. 11A is a side view of the optical assembly, and FIG. 2) is a partial cross-sectional view of the optical assembly of FIG. In FIG. 11, the same reference numerals are assigned to the corresponding parts in FIG. 1 and FIG. 10 described above.

  The lens frame 30-3 in FIG. 11 supports the CCD as the image pickup device 22 and the low-pass filter 20 corresponding thereto as in the above-described case, and the lower skirt portion 30-31 of the optical prism 100-6. It is combined with the optical prism 100-6 so as to be fitted into the top of the exit surface 12 side.

  In the optical assembly of FIG. 11, the lens frame 30-3 is positioned above and below the skirt portion 30-31 and supports the low-pass filter 20 and the image pickup device 22, while blocking the outside light. 32, and the skirt portion 30-31 and the side wall portion 30-32 cooperate with the low-pass filter 20 and the emission surface 12 of the optical prism 100-6 to form a substantially sealed space portion. A shielding member is formed. In other words, in this embodiment, the shielding member has a skirt portion 30-31 extending upward from the optical prism 100-6 side, and a side wall portion 30-32 extending from the lens frame 30-3 as a flange portion. It is joined.

  According to the form of FIG. 11, since the closed space is formed on the exit surface 12 side of the optical prism, the possibility that dust or the like adheres to the exit surface 12 and the optical characteristics are hindered is reduced.

  12A and 12B are views showing still another form of the optical assembly described with reference to FIG. 11. FIG. 12A is a side view of the optical assembly, and FIG. 12B is an optical view of FIG. FIG. 6 is a partial cross-sectional view of the assembly. In FIG. 12, the same reference numerals are assigned to the corresponding parts in FIGS. 1, 10 and 11 described above.

  The lens frame 30-4 in FIG. 12 supports the CCD as the image sensor 22 and the low-pass filter 20 corresponding to the CCD 30 as in the above, and the lower skirt portion 30-41 of the optical prism 100-6. It is combined with the optical prism 100-6 so as to be inserted into the top of the incident surface 12 side.

  In the optical assembly of FIG. 12, the lens frame 30-4 has a skirt portion 30-41 at the lower portion thereof, and a side wall portion 30-42 that is positioned above and shields the external light while supporting the low-pass filter 20 and the CCD 22. Are connected to each other seamlessly to cooperate with the low-pass filter 20 and the emission surface 12 of the optical prism 100-6 to form a shielding member that constitutes a substantially sealed space. In other words, in this embodiment, the shielding member extends downward from the lens frame 30-3 and is joined by a flange portion that is a convex portion of the optical prism 100-6.

  Also in the form of FIG. 12, since a closed space is formed on the exit surface 12 of the optical prism, the possibility that dust or the like adheres to the exit surface 12 and the optical characteristics are hindered is reduced.

The embodiment shown in FIGS. 14 to 19 is an example using an imaging optical prism 101 of a type different from the embodiment shown in FIGS. 1 to 12. This optical prism 101 is shown in FIG. As shown in a schematic side cross-sectional view of an optical assembly combined with 101, three optical working surfaces 15, 16, and 17 are provided on the surface 17. 101 is an incident surface 17 that is incident on the inside of the surface 101. The surface 15 first reflects the light incident from the incident surface 17 toward the opposing surface (reflective surface) 16 side, and the second reflection from the reflective surface 16. The reflected light is refracted and emitted to the outside of the optical prism 101, and is also a reflective surface and an output surface 15 that also serves as an output surface for forming an image of an object on the image pickup surface 21 of the image sensor 22. First at surface and exit surface 15 The reflected ray is again reflection surface for reflecting to the reflecting surface and the exit surface 15 side. The three surfaces 15, 16, and 17 are free-form surfaces, spherical surfaces, aspheric surfaces, anamorphic surfaces, or the like so that the optical prism 101 has a positive power (refractive power: reciprocal of focal length). It is comprised from the curved surface. It is desirable that at least one of the surfaces is composed of a plane-symmetry free-form surface having a single symmetry surface that gives power to the light flux and corrects decentration aberrations.

  The example of FIG. 14 is a schematic diagram showing an assembled state of the imaging optical prism 101 and the corresponding lens frame 30. 14A is a diagram showing a state in which the optical prism 101 and the lens frame 30 are assembled. FIG. 14B is an exploded view of the optical prism 101 and the lens frame 30. FIG.

  In FIG. 14, in the optical prism 101, incident light is incident on the left surface 106L and the right surface 106R formed in the directions intersecting with the respective directions of the incident surface 17, the reflecting surface 16, and the reflecting surface 15 and the emitting surface 15. Recesses 107L and 107R are formed so as not to obstruct the optical path within the effective diameter from the first to the reflecting / exiting surface 15, respectively. In the example of FIG. 14, these concave portions 107 </ b> L and 107 </ b> R are configured such that the upper block portion of the optical prism 101 in which the front and rear surfaces are constituted by the reflection surface 16 and the reflection surface / output surface 15 is the entrance surface 17 and the reflection surface / output It is formed so as to be narrowed by the left and right step portions 108L and 108R from the block portion on the lower side of the optical prism 101 in which the front and rear surfaces are constituted by the surface 15.

  The convex portions 109L and 109R are provided so as to protrude outward from the respective surfaces of the left side surface 106L and the right side surface 106R in the concave portions 107L and 107R.

  As can be understood from the above description with reference to FIG. 14, the incident surface 17, the reflection / exit surface 15, and the reflection surface 16 are each formed in a substantially quadrilateral shape by ridge lines around these surfaces. Therefore, it is easy to ensure the processing accuracy of the mold when the optical prism 101 is molded by the injection molding method, and therefore it is easy to ensure the processing accuracy of the optical prism itself.

  Further, in the lens frame 30 which is a hollow rectangular frame shown in FIG. 14, a CCD as an image pickup element 22 and a low-pass filter 20 corresponding to the CCD are supported therein, as shown in a cross section in FIG. The optical system mounting portions 131L and 131R are formed on the left and right vertical member portions of the lens frame 30 so as to protrude left and right, and screw holes 132L and 132R are provided in the front-rear direction substantially at the center thereof. ing. On the other hand, through-holes 109Lh and 109Rh (not shown) in the front-rear direction corresponding to the screw holes 132L and 132R are formed in the convex portions 109L and 109R formed in the concave portions 107L and 107R of the optical prism 101, respectively. Screws 150L and 150R (not shown) pass through these through holes 109Lh and screw holes 132L, and through the through holes 109Rh and screw holes 132R, the convex portions 109L and 109R of the optical prism 101 and the optical system attachment portions 131L of the lens frame 30. , 131R and the corresponding relative positions of the corresponding members are positioned. As illustrated, the optical system mounting portions 131L and 131R are provided with concave portions corresponding to the convex portions 109L and 109R of the optical prism 101, respectively, and the convex portions 109L and 109R are inserted into the concave portions without a gap. Positioning is performed in any of the front-rear, left-right, and up-down directions.

  FIG. 15 is a schematic diagram showing an assembled state of the optical prism 101 similar to that of FIG. 14 described above and the lens frame 30 corresponding thereto.

  15A is a diagram showing a state in which the optical prism 101 and the lens frame 30 are assembled, and FIG. 15B is an exploded view of the optical prism 101 and the lens frame 30, and FIG. (C) part of FIG. 15 is the elements on larger scale seen from the arrow A direction regarding the (b) part of FIG.

  In FIG. 15, the same reference numerals are given to the corresponding parts in FIG. 14 described above, and detailed description thereof will be omitted.

  As shown in the figure, a lens frame 30, which is a hollow rectangular frame in which a CCD as an image pickup device 22 and a low-pass filter 20 corresponding to the CCD, are supported, has left and right vertical member portions. The optical system mounting portions 131La and 131Ra are formed so as to protrude left and right, and fitting grooves 133L and 133R are provided so as to be rounded up from their respective bottom portions in the vertical direction. Protrusions 133La and 133Ra forming a click mechanism for positioning are formed at the middle level position in the vertical direction of the fitting grooves 133L and 133R.

  On the other hand, the convex portions 109La and 109Ra formed in the concave portions 107L and 107R of the optical prism 101 have shapes corresponding to the above-described fitting grooves 133L and 133R, respectively. Recessed portions 109La1 and 109Ra1 corresponding to the protruding portions 133La and 133Ra that form the click mechanism for positioning are formed in the standard position. When the convex portions 109L and 109R of the optical prism 101 are fitted to the proper positions in the fitting grooves 133L and 133R of the optical system attachment portions 131La and 131Ra, the protrusions 133La and 133Ra that form the click mechanism for positioning are arranged. Is inserted into the concave portions 109La1 and 109Ra1 formed on the convex portions 109La and 109Ra of the optical prism 101 without gaps, so that the positioning can be surely performed in any of the front, rear, left, right, and up and down directions. It is configured. Therefore, it can be easily assembled without using other parts such as screws. FIG. 15 (c) shows a partially enlarged view of the portion (b) of FIG. 15 as viewed from the direction of the arrow A, and the projection of the optical prism 101 protruding in an L shape when viewed from vertically above or below. The state of the fitting of the fitting groove 133L of the portion 109La and the optical system attachment portion 131La having a shape corresponding to the portion 109La is understood.

  As described above, as can be understood from the description using the drawings and the drawings, each of the protrusions 109L, 109R, 109La, and 109Ra has at least one or more plane portions, The predetermined plane portion is substantially parallel to or substantially perpendicular to the image sensor mounting surface formed on the lens frame 30 as a frame member. Therefore, positioning according to the relative position between the optical prism and the image sensor It is easy to ensure accuracy.

  Further, the positioning portion having a positioning function related to the relative position has a fitting convex portion or a fitting concave portion corresponding to the fitting concave portion or the fitting convex portion formed in the frame member (lens frame 30). Further, the fitting convex portion or the fitting concave portion is an overhang portion for restricting the release of the fitting with the fitting concave portion or the fitting convex portion on the corresponding frame member (lens frame 30) side at least in a specific direction. Alternatively, a concave portion is formed, and therefore, it is easy to ensure the positioning accuracy related to the relative position between the optical prism and the imaging device, and the assembly is easy.

  Further, the protruding portion or the recessed portion is a dovetail portion or dovetail portion corresponding to the dovetail portion or the dovetail portion as the fitting recess or fitting convex portion formed in the frame member (lens frame 30). Even if it is configured in this way, it is easy to ensure the positioning accuracy related to the relative position between the optical prism and the image sensor, and the assembly is easy.

  FIG. 16 is a schematic diagram showing an assembled state of the optical prism 101 similar to that of FIGS. 14 and 15 described above and the lens frame 30 corresponding thereto.

  16A is a diagram showing a state in which the optical prism 101 and the lens frame 30 are assembled, and FIG. 16B is an exploded view of the optical prism 101 and the lens frame 30. FIG.

  In FIG. 16, the same reference numerals are given to the corresponding parts in FIGS. 14 and 15 described above, and detailed description thereof will be omitted.

  As shown in the figure, a lens frame 30, which is a hollow rectangular frame in which a CCD as an image pickup device 22 and a low-pass filter 20 corresponding to the CCD, are supported, has left and right vertical member portions. The optical system mounting portions 131Lb and 131Rb are formed so as to protrude to the left and right, and these optical system mounting portions 131Lb and 131Rb are formed by forming two parallel cuts from the front end portion toward the rear. Elastic pieces 134L and 134R defined by the cut are formed. Protruding portions 134Lb and 134Rb for fitting are formed on the inner sides in the vicinity of the front ends of the elastic piece portions 134L and 134R.

  On the other hand, the convex portions 109La and 109Ra formed in the concave portions 107L and 107R of the optical prism 101 have shapes corresponding to the optical system mounting portions 131Lb and 131Rb, respectively. Recessed portions 109Lb and 109Rb corresponding to the fitting protrusions 134Lb and 134Rb are formed at the level position. The projections 134Lb and 134Rb for fitting of these optical system mounting portions 131Lb and 131Rb are elastically fitted into the concave portions 109Lb and 109Rb of the convex portions 109La and 109Ra of the optical prism 101 without gaps, so that they are front and rear, right and left and up and down. These are configured so as to be surely positioned in any direction. Therefore, it can be easily assembled without using other parts such as screws.

  FIG. 17 is a schematic diagram showing an assembled state of the optical prism 101 similar to that shown in FIGS. 14 to 16 and the lens frame 30 corresponding thereto.

  17A is a view showing a state in which the optical prism 101 and the lens frame 30 are assembled, and FIG. 17B is an exploded view of the optical prism 101 and the lens frame 30. FIG.

  In FIG. 17, the same reference numerals are given to the corresponding parts in FIGS. 14 to 16 described above, and detailed description thereof will be omitted.

  As shown in the figure, a lens frame 30, which is a hollow rectangular frame in which a CCD as an image pickup device 22 and a low-pass filter 20 corresponding to the CCD, are supported, has left and right vertical member portions. The optical system attachment parts 131Lc and 131Rc are formed so as to protrude left and right, and the optical system attachment parts 131Lc and 131Rc are formed with square holes 135L and 135R for fitting in the vicinity of their front ends. These optical system attaching portions 131Lc and 131Rc are elastically coupled to the left and right longitudinal member portions of the lens frame 30 or are themselves elastic bodies.

  On the other hand, the convex portions 109Lc and 109Rc formed in the concave portions 107L and 107R of the optical prism 101 have shapes corresponding to the fitting square holes 135L and 135R provided in the optical system mounting portions 131Lb and 131Rb, respectively. The projections 109Lc and 109Rc of the optical prism 101 are elastically fitted into the optical system mounting portions 131Lc and 131Rc of the lens frame 30 into the fitting square holes 135L and 135R without gaps, so These are configured so as to be surely positioned in any direction. Therefore, it can be easily assembled without using other parts such as screws.

  In the examples of FIGS. 16 and 17, each of the convex portions 109La, 109Ra, 109Lc, and 109Rc functions as a positioning portion, and the change of the relative position with respect to the positioning portion is suppressed by the elastic force due to its own elastic deformation. Elastic pieces 134L and 134R, which are elastic pieces formed on the frame member (lens frame 30), and optical system attachment portions 131Lb and 131Rb are brought into contact with each other, and a receiving surface adapted to receive this elastic force is formed. Therefore, it is easy to ensure the positioning accuracy related to the relative position between the optical prism and the display element, and the assembly is easy.

  18 and 19 show another embodiment of the present invention. In this example, an optical prism 100-7 as shown in FIG. 1B employs the same attachment mechanism for the lens frame 30 as in FIG.

  18A is a perspective view of the optical prism according to the present embodiment as seen from a line of sight from an obliquely upper front that mainly looks at the incident surface (front side) of the optical prism. FIG. Is a perspective view of the output prism and the reflection surface (back side) as seen from the line of sight from the upper oblique rear side, and FIG. 10 (c) shows the optical prism as viewed in the width direction. It is a side view. FIG. 19 is a schematic view showing an assembled state of the optical prism 100-7 in FIG. 18 and the corresponding lens frame 30. FIG. 19 (a) shows the optical prism 100-7, the lens frame 30, and the like. FIG. 19B is an exploded view of the optical prism 100-7 and the lens frame 30. FIG. 18 and 19, the corresponding parts to those in FIGS. 1 and 14 described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 19, a left and right vertical members are provided in a lens frame 30 which is a hollow rectangular frame in which a CCD as an image sensor 22 and a low-pass filter 20 corresponding thereto are supported. The optical system attachment portions 131L and 131R are formed in the portion so as to protrude left and right, and screw holes 132L and 132R are provided in the front-rear direction substantially at the center thereof. On the other hand, the convex portions 190L and 190R formed in the concave portions 70L and 70R of the optical prism 100-7 are provided with through holes 190Lh (not shown) and through holes 190Rh in the front-rear direction corresponding to the screw holes 132L and 132R, respectively. ing. Screws 150L (not shown) and screws 150R pass through the through-holes 190Lh and the screw holes 132L, and the through-holes 190Rh and the screw holes 132R, and the projections 190L and 190R of the optical prism 100-7 and the lens frame 30 Each optical system attachment part 131L and 131R are couple | bonded, and the relative position of each corresponding member is positioned. As shown in the figure, concave portions corresponding to the respective convex portions 190L and 190R of the optical prism 100-7 are formed in the optical system attaching portions 131L and 131R, and the convex portions 190L and 190R are fitted into these concave portions without a gap. Thus, positioning is performed in any of the front and rear, right and left and up and down directions.

  The above is an example in which a lens frame that supports an imaging element or the like is attached to an optical prism via convex portions or concave portions provided on both side surfaces of the optical prism, but some examples of other attachment mechanisms are shown. 20 to 24 show an example in which the CCD 22 (imaging device) attached to the CCD substrate 23 is fixed to the imaging surface in front of the reflection surface / output surface 15 of the optical prism 101 shown in FIG. Corresponding parts to those in FIGS. 1 to 19 are given the same reference numerals, and detailed description thereof is omitted.

  FIG. 20 is a diagram showing another embodiment of the present invention. In this example, column members 161 and 162 for mounting the CCD substrate are integrally formed outside the effective area of the reflecting and emitting surface 15 of the optical prism 101 as shown in FIG.

FIG. 20 is a schematic diagram showing an assembled state of the imaging optical prism 101 and the CCD substrate 23 corresponding thereto. 20A is a view showing a state where the optical prism 101 and the CCD substrate 23 are assembled, and FIG. 20B is an exploded view of the optical prism 101 and the CCD substrate 23. As shown in FIG.

  In this example, two column members 161 and 162 for mounting a CCD substrate are integrally formed with the optical prism 101 at opposing positions outside the effective area of the reflecting / exiting surface 15 of the optical prism 101. Pins 161a and 162b are provided at the tips of the members 161 and 162, respectively. The pin 161a is inserted into the mounting hole 23a provided with the CCD substrate 23, and the pin 161b is inserted into the mounting long hole 23b provided with the CCD substrate 23. Then, the pins 161a and the mounting holes 23a, the pins 161b and the mounting long holes 23b are positioned, and the CCD substrate 23 is fixed to the optical prism 101 by an adhesive or the like.

  FIG. 21 is a view showing a modification of FIG. 20 of the present invention. In this example, a prismatic cylindrical member 163 for mounting a CCD substrate is integrally formed outside the effective area of the reflecting and emitting surface 15 of the optical prism 101 as shown in FIG.

  FIG. 21 is a schematic diagram showing an assembled state of the imaging optical prism 101 and the CCD substrate 23 corresponding thereto. 21A is a view showing a state in which the optical prism 101 and the CCD substrate 23 are assembled, and FIG. 21B is a perspective view of the optical prism 101. FIG.

  In this example, a prismatic cylindrical member 163 is formed integrally with the optical prism 101 so as to surround the effective area of the reflecting / exiting surface 15 of the optical prism 101, and the CCD 22 is inserted inside the tip to insert the prism 22 into the prism. The CCD substrate 23 is positioned and fixed to the end surface of the cylindrical member 163 with an adhesive or the like.

  FIG. 22 is a diagram showing a modification of FIG. In this example, elastic pieces 165a and 165b for attaching the CCD substrate 23 are provided at the time of molding on a prismatic cylindrical member 163a that is integrally molded outside the effective area of the reflecting and emitting surface 15 of the optical prism 101. FIG. 22 is a schematic diagram showing an assembled state of the imaging optical prism 101 and the CCD substrate 23 corresponding thereto. 22A is a partially omitted perspective view of a prismatic cylindrical member 163a to be integrally formed, and FIG. 22B is a sectional view showing a state in which the CCD substrate 23 is assembled to the prismatic cylindrical member 163a. It is.

  Also in this example, the prismatic cylindrical member 163a is formed integrally with the optical prism 101 so as to surround the effective area of the reflecting / exiting surface 15 of the optical prism 101, and each of the two opposing walls has 2 Elastic pieces 165a and 165b are formed by the notch 164 of the book. Protrusions 166 are formed on the inner ends of the elastic pieces 165a and 165b. Further, a stepped surface 163ap is provided on the inner surface of the prismatic cylindrical member 163a. With this configuration, when the opposing elastic pieces 165a and 165b are opened against elasticity, the CCD substrate 23 is inserted into the prismatic cylindrical member 163a and the elastic pieces 165a and 165b are released, the elastic pieces 165a and 165b are released. The 165b is closed so as to approach each other, and the CCD substrate 23 is pressed from both sides. At this time, the CCD substrate 23 is pressed against the step surface 163ap inside the prismatic cylindrical member 163a by the protrusions 166 at the tips of the elastic pieces 165a and 165b, and is positioned and fixed.

  FIG. 23 is a diagram showing another embodiment of the present invention. In this example, a positioning bank portion 167 is integrally formed outside the effective area of the reflecting and emitting surface 15 of the optical prism 101 as shown in FIG. 13, and a lens frame 168 in which a CCD substrate 23 is mounted in the bank. It is an example which inserts and fixes positioning.

FIG. 23 is a schematic diagram showing an assembled state of the imaging optical prism 101 and the CCD substrate 23 corresponding thereto. 23A is an exploded view of the optical prism 101, the lens frame 168, and the CCD substrate 23. In FIGS. 23B and 23C, the optical prism 101 and the CCD substrate 23 are assembled. It is sectional drawing which shows a state, (b) part is sectional drawing of the direction along a side surface, (c)
The section is a cross-sectional view in the direction along the incident surface 17.

  In this example, a positioning bank portion 167 is formed integrally with the optical prism 101 so as to surround the effective area of the reflecting surface and the exit surface 15 of the optical prism 101, and one of the positioning banks 167 includes one of the positioning banks 167. A lens frame 168 having a CCD substrate 23 attached thereto is inserted into the opening 168a and positioned and fixed to the optical prism 101 by any means such as an adhesive.

  FIG. 24 is a diagram showing another embodiment of the present invention. In this example, a mounting mechanism similar to that shown in FIG. 1 or FIG. 14 and, as a modification thereof, convex portions or the like are not integrally formed on both side surfaces of the optical prism, and the outside of the effective area of the optical surface of the optical prism is used for positioning and fixing. It is an example.

  FIG. 24 is a schematic diagram showing an assembled state of the imaging optical prism 101 and the CCD substrate 23 corresponding thereto. 23 (a) and 23 (b) are sectional views showing a state in which the optical prism 101 and the CCD substrate 23 are assembled, (a) is a sectional view along a side surface, and (b) is a sectional view. 4 is a cross-sectional view in a direction along the incident surface 17. FIG. Part (c) is a cross-sectional view in the direction along the incident surface 17 showing a state in which the optical prism 101 and the CCD substrate 23 showing the modification are assembled.

  In this example, in the case of portions (a) and (b) in FIG. 23, the convex portions 109L and 109R are projected from the respective surfaces of the left side surface 106L and the right side surface 106R of the optical prism 101 to the outside. Is integrally molded. Further, extension portions 169L and 169R are formed on both sides of the other opening of the lens frame 169 to which the CCD substrate 23 is attached to one opening, and the protrusions 109L and 109R are provided at the ends of the extension portions 169L and 169R. A pin is provided to be inserted into the hole. In such a configuration, the lens frame 169 is assembled to the optical prism 101 so that the extension parts 169L and 169R of the lens frame 169 sandwich the side surfaces 106L and 106R of the optical prism 101, and the pins at the tips of the extension parts 169L and 169R are the protrusions 109L. , 109R is inserted into a hole 109R and fixed with an adhesive or the like, thereby being positioned and fixed to the optical prism 101.

  In the case of the part (c) of FIG. 23, the projection of the lens frame 170 in which the CCD substrate 23 is attached to one opening without providing the convex part as in the case of the parts (a) and (b) of FIG. Extension portions 170L and 170R are formed on both sides of the other opening, positioning step surfaces 170La and 170Rb are formed at the roots of the extensions 170L and 170R, and the extension portions 170L and 170R of the lens frame 170 are formed on the optical prism 101. When the lens frame 170 is assembled to the optical prism 101 so as to sandwich the side surfaces 106L and 106R, the positioning step surfaces 170La and 170Rb come into contact with the surfaces outside the effective area on both sides of the reflecting surface and the emitting surface 15 of the optical prism 101. Then, an adhesive or the like is applied to the contact surface or side surface and the extension portions 170L and 170R for positioning and fixing.

  The above is an example in which an optical element and an optical prism are attached when one optical prism is used. However, there are cases where an imaging optical system is formed using two optical prisms.

FIG. 25 shows an example of an imaging optical system using such two optical prisms. This optical system includes, in order from the object side, a first optical prism 210 and a second optical prism 220, and a low-pass filter 20 and a diaphragm 202 are disposed between the first optical prism 210 and the first optical prism 210. The second optical prism 220 includes a first power transmission surface 221 having a positive power, a first power transmission surface 221 having a positive power, and a second power transmission surface 214 having a positive power. The first reflecting surface 222, the second reflecting surface 223 having a positive power, and the second transmitting surface 224 having a negative power. The image sensor 22 is disposed on the image plane 203 of the optical system. Reference numeral 205 denotes a cover glass that protects the imaging surface of the imaging element 22. In the case of this optical system, the first transmission surface 211 and the second reflection surface 213 of the first prism 210, and the first reflection surface 222 and the second transmission surface 224 of the second prism 220 have both a transmission function and a reflection function, respectively. It is a surface. In the optical prisms 210 and 220 in this case, the optical surfaces 211 to 214 and 221 to 224 are formed of free-form surfaces or curved surfaces such as spherical surfaces, aspheric surfaces, and anamorphic surfaces. At least one surface of each of the optical prisms 210 and 220 is preferably composed of a plane-symmetry free-form surface having a single symmetry surface that gives power to the light flux and corrects decentration aberrations.

  An example of an attachment mechanism for integrally attaching the two optical prisms 210 and 220 as described above, and an example of an attachment mechanism for integrally attaching the CCD to the image plane will be described below. FIG. 26A is a perspective view before the two optical prisms 210 and 220 are integrally attached, and FIG. 26B is a rear view after the two optical prisms 210 and 220 are integrally attached. Attachment pieces 232 and 232 are integrally provided at the time of molding, and attachment pieces 231 and 231 are integrally provided at both side surfaces outside the optical path of the optical prism 220 at the time of molding. One mounting piece 231 has a shape extending from both side surfaces toward the other optical prism 210, for example, a protrusion 233 is provided at the tip thereof, and the other mounting piece 232 is provided with one mounting piece 231. A hole 234 for receiving the protrusion 233 is provided. With this configuration, the protrusions 233 and 233 of the mounting pieces 231 and 231 outside the optical path of the optical prism 220 are fitted into the holes 234 and 234 of the mounting pieces 232 and 232 outside the optical path of the optical prism 210, and are bonded and screwed. By integrating the mounting pieces 231 and 232 by means such as heat caulking, the two optical prisms 210 and 220 are mechanically integrated so that the optical axis and the interval are not shifted, and the assembly is easy. become.

  FIG. 27 is a perspective view showing an example of a structure in which the CCD 22 arranged on the image plane of the imaging optical system is mechanically integrally attached to the integrated structure of the two optical prisms 210 and 220 as shown in FIG. Show. In this example, in order to integrally attach the two optical prisms 210 and 220, the mounting bracket 235 is fitted into the mounting pieces 231 and 231 that are integrally formed on both side surfaces of the one optical prism 220, and are bonded and screwed. The two optical prisms 210 and 220 are formed by fixing by a means such as heat caulking, and by similarly fitting the substrate 23 supporting the CCD 22 into the metal fitting 235 and fixing by means of adhesion, screwing, heat caulking or the like. The CCD 22 is mechanically and integrally attached to the image plane of the imaging optical system so that the optical axis and the interval are not shifted and the assembly is facilitated.

  FIG. 28 is a side view showing another example of a mounting mechanism that mechanically and integrally attaches the two optical prisms 210 and 220 and the CCD 22, and the two optical prisms 210 and 220 have both sides outside the respective optical paths. The distance between the mounting pieces 231, 232 provided by integral molding on the surface is positioned by the bar-shaped spacer 238, and the mounting pieces 231, 232 and the bar-shaped spacer 238 are fixed by the screws 239, thereby the two optical prisms 210, 220. Are mechanically integrated. Then, the L-shaped metal fitting 236 is mechanically fixed to the rod-shaped spacer 238 as viewed from the side, and another attachment metal fitting 237 is attached to both sides of the metal fitting 236, and the substrate 23 supporting the CCD 22 is bonded to the metal fitting 237. In this example, the mounting bracket 237 sandwiches both side surfaces of the optical prism 220 to increase the mounting stability.

FIG. 29 is a side view showing another example of a mounting mechanism that mechanically and integrally attaches two optical prisms 210 and 220 and the CCD 22, and the space between the two optical prisms 210 and 220 is the same as in FIG. The interval between the mounting pieces 231 and 232 provided by integral molding on both side surfaces outside the optical paths of the optical prisms 210 and 220 is positioned by the rod-shaped spacer 238, and the mounting pieces 231 and 232 and the rod-shaped spacer 238 are fixed by screws 239. By fixing, the two optical prisms 210 and 220 are mechanically integrated. Further, the optical frame 220 and the lens frame 30 supporting the CCD 22 inside are similar to FIG.
The convex portions 109L and 109R of the optical prism 220 and the optical system mounting portions 131L and 131R of the lens frame 30 are coupled, and the relative positions of the corresponding members are positioned. A mounting bracket 290 for mechanically integrating the low-pass filter 20 between the first optical prism 210 and the second optical prism 220 is mechanically integrated with the rod-shaped spacer 238. The low-pass filter 20 is positioned and fixed by means such as stopping and caulking.

  In the above-described mechanism for attaching the lens frame and the optical prism, in order to adjust the focus, for example, the position of the image sensor 22 may be adjusted in the direction along the optical axis emitted from the optical prism in the lens frame.

  The optical assembly of the optical prism and the lens frame according to the present invention as described above forms an object image, and the image is received by a solid-state image pickup device such as a CCD, and particularly a camera or an endoscope. The imaging optical system can be used. The embodiment is illustrated below.

  FIG. 30 is a conceptual diagram of a configuration in which the optical assembly according to the present invention is incorporated in the objective optical system 248 of the photographing unit of the electronic camera 240. In this example, the imaging objective optical system 248 disposed on the imaging optical path 242 uses an imaging optical system as shown in FIG. An object image formed by the photographing objective optical system is formed on the imaging surface 21 of the CCD 22 through a filter 251 such as an infrared cut filter. In order to attach the low-pass filter 20, the filter 251, and the CCD 22 to the photographing objective optical system 248, any mechanism in the above-described embodiment is used. The object image received by the CCD 22 is displayed as an electronic image on a liquid crystal display element (LCD) 260 via the processing means 252. The processing unit 252 also controls the recording unit 261 that records the object image captured by the CCD 22 as electronic information. The image displayed on the LCD 260 is guided to the observer eyeball E through the eyepiece optical system 259. The eyepiece optical system 259 is composed of a decentered prism having the same form as that used in the optical prism of the present invention. In this example, the entrance surface 262, the reflection surface 263, and the combined reflection and refraction surface 264 are used. It is comprised from three surfaces. In addition, at least one of the two reflecting surfaces 263 and 264, preferably both surfaces, provides power to the luminous flux and has a single symmetry plane that corrects decentration aberrations. It consists of a curved surface. The only symmetry plane is formed on substantially the same plane as the only symmetry plane of the plane-symmetric free-form surface included in the optical prisms 210 and 220 of the photographing objective optical system 248.

  The camera 240 configured as described above can configure the objective optical system 248 for photographing with a small number of optical members, achieve high performance and low cost, and arrange the entire optical system side by side on the same plane. A book shape with a thickness in the direction perpendicular to the plane can be realized.

  In this example, a plane-parallel plate is disposed as the cover member 265 of the photographing objective optical system 248, but a lens having power may be used.

  Here, without providing the cover member, the surface of the first optical prism 210 of the imaging optical system that is disposed closest to the object can also be used as the cover member. However, in that case, the most object-side surface of the first optical prism 210 is the incident surface of the first optical prism 210. And since this incident surface is eccentrically arranged with respect to the optical axis, if this surface is arranged on the front side of the camera, the shooting center of the camera 240 is shifted from itself when viewed from the subject side. An illusion occurs (it is normal to feel that the vertical direction of the incident surface is being photographed, as in a general camera), which gives a sense of incongruity. Therefore, as in this example, when the surface closest to the object side of the imaging optical system is an eccentric surface, it is possible to provide the cover member 265 without feeling uncomfortable when viewed from the subject side. It is desirable to be able to receive photographs with the same feeling as a camera.

  Next, FIG. 31 shows a conceptual diagram of a configuration in which the optical assembly according to the present invention is incorporated in the objective optical system 280 of the observation system of the electronic endoscope. As shown in FIG. 31A, the electronic endoscope includes an electronic endoscope 271, a light source device 272 that supplies illumination light, and a video processor 273 that performs signal processing corresponding to the electronic endoscope 271. A video signal output from the video processor 273, a VTR deck 275 connected to the video processor 273 and recorded on the video signal, a video disk 276, and the video signal printed as video. The distal end portion 279 of the insertion portion 278 of the electronic endoscope 271 is configured as shown in FIG. 31B. The light beam illuminated from the light source device 272 passes through the light guide fiber bundle 286 and illuminates the observation site by the illumination objective optical system 285. Then, light from this observation site is formed as an object image by the observation objective optical system 280 via the cover member 284. This object image is formed on the imaging surface 21 of the CCD 22 via a filter 281 such as an infrared cut filter. Further, this object image is converted into a video signal by the CCD 22, and the video signal is displayed directly on the monitor 274 by the video processor 273 shown in FIG. 31 (a), and in the VTR deck 275 and the video disc 276. And printed out as video from the video printer 277.

  The endoscope configured as described above can be configured with a small number of optical members, can achieve high performance and low cost, and the first optical prism 210 and the second optical prism 220 of the imaging optical system 280 can be viewed as an endoscope. Since the mirrors are arranged in the major axis direction, the above effect can be obtained without obstructing the diameter reduction. In this example as well, a plane parallel plate is disposed as the cover member 284, but a lens having power may be used.

  Here, FIG. 32 shows a desirable configuration when the optical prisms 100, 101, 210, and 220 of the present invention are arranged in front of an image sensor such as a CCD or a filter. In the figure, the decentered prism P is the optical prism 100, 101, 210, 220 of the present invention. Now, when the imaging surface C of the imaging device forms a quadrangle as shown in the figure, the symmetry plane D of the plane-symmetric free-form surface disposed on the eccentric prism P is at least one of the sides forming the quadrangle of the imaging surface C. In order to form a beautiful image, it is desirable to arrange them parallel to each other.

  Further, when the imaging surface C has four interior angles such as a square and a rectangle formed at approximately 90 °, the symmetry plane D of the plane-symmetry free-form surface has two sides parallel to each other of the imaging surface C. Is more preferably arranged in the middle of the two sides, and the symmetry plane D is configured to coincide with the position where the imaging plane C is symmetrical left and right or up and down. If comprised in this way, the assembly precision at the time of incorporating in an apparatus will be easy to be taken out, and it is effective for mass productivity.

  Further, in the case where a plurality of surfaces or all of the first, second, and third surfaces, which are optical surfaces constituting the decentered prism P, are plane-symmetric free-form surfaces, a plurality of surfaces or all of the surfaces It is desirable in terms of design and aberration performance that the planes of symmetry are arranged on the same plane D. The relationship between the symmetry plane D and the imaging plane C is desirably the same as described above.

  Each of the optical prisms of the above-described embodiments is composed of three optical surfaces, one of which is a surface that has both the total reflection function and the transmission function, and has two internal reflections. Although a prism is used, the optical prism of the present invention is not limited to this.

  The optical prism, the lens frame, and the optical assembly of the present invention described above can be configured as follows, for example.

[1] Provided with at least three optical surfaces, the incident light from the incident surface suitable for the incidence of light from the subject is reflected twice or more inside itself to bend the optical path, and output from the predetermined emission surface as the emitted light An optical prism configured to be emitted to the outside and form an image of a subject on an imaging surface disposed outside, wherein at least one of the incident surface or the emission surface has a transmission effect and an internal reflection effect. In an optical prism consisting of optical surfaces to perform,
The optical prism is used in combination with a lens frame configured to be adapted to the optical prism, and the optical prism is formed on a side surface formed in a direction crossing each direction of the entrance surface and the exit surface. A convex portion for attaching the lens to the lens frame is formed.

    [2] The optical prism as described in [1] above, wherein the convex portion is provided with a positioning boss for maintaining a relative position with the lens frame in a predetermined relationship at the predetermined portion. .

    [3] The optical prism is manufactured by an injection molding method, and the convex portion is molded by using a slide mechanism applied to the injection molding method. 2. The optical prism according to 1 above.

    [4] Effective areas in the optical surface such as the incident surface, the exit surface, and the reflective surface related to the reflection are set at a distance of 0.5 to 5.0 mm from a portion formed by using the slide mechanism. 4. The optical prism according to 3 above, wherein the optical prism is configured as described above.

    [5] The optical prism as described in [3] above, wherein a plurality of mounting surfaces used for mounting a predetermined member are formed on a convex portion formed by using the slide mechanism.

    [6] The optical prism as set forth in [3], wherein a cavity number applied to the injection molding is engraved in a predetermined region of a convex portion molded using the slide mechanism.

    [7] The optical prism according to [5], wherein the plurality of mounting surfaces are formed in parallel to each other.

    [8] The optical prism is manufactured by an injection molding method, and has a ridgeline formed by contacting surfaces defining the outer shape of the optical prism, such as the incident surface or a surface functioning as an output surface. 2. The optical prism according to 1 above, wherein a mold dividing line for injection molding is set so as to be along a virtual plane that roughly includes two ridge lines that are not adjacent to each other but are opposed to each other. .

    [9] The optical system according to [8], wherein the mold parting line is set so as to form an angle represented by a natural number with respect to a reference mold parting line set for the injection molding. prism.

    [10] The optical prism is manufactured by an injection molding method, and a mold parting line related to injection molding is set corresponding to a predetermined part, and the predetermined part corresponding to the mold parting line is set. 2. The gate according to claim 1, wherein a gate for injecting the resin is formed and / or a plurality of protrusions for protrusion are formed at equidistant positions from the center of gravity related to the protrusion force. Optical prism.

    [11] The optical prism as set forth in [10], wherein the protrusions for protrusion are formed with substantially the same thickness.

[12] At least three optical surfaces are provided, and incident light from an incident surface suitable for receiving light from an object is reflected twice or more inside itself to bend the optical path, and output from a predetermined emission surface An optical prism configured to be emitted to the outside and form an image of a subject on an imaging surface disposed outside, wherein at least one of the incident surface or the emission surface has a transmission effect and an internal reflection effect. In an optical prism consisting of optical surfaces to perform,
A ghost-preventing surface having a different definition from the optical surface adjacent to one of the optical surfaces such as the incident surface, the output surface, and the reflecting surface related to the reflection has a predetermined angle with respect to the one surface. An optical prism characterized by being provided.

[13] At least three optical surfaces are provided, and incident light from an incident surface suitable for receiving light from a subject is reflected twice or more inside itself to bend an optical path, and output from a predetermined emission surface as emitted light. An optical prism configured to be emitted to the outside and form an image of a subject on an imaging surface disposed outside, wherein at least one of the incident surface or the emission surface has a transmission effect and an internal reflection effect. In an optical prism consisting of optical surfaces to perform,
A satin-finished ghost-preventing surface having a different definition from the optical surface is provided on the same surface as one of the optical surfaces such as the entrance surface, the exit surface, and the reflective surface related to the reflection. An optical prism characterized by.

[14] Provided with at least three optical surfaces, the incident light from the incident surface suitable for the incidence of light from the subject is reflected two or more times within itself to bend the optical path, and output from the predetermined emission surface as the emitted light An optical prism configured to be emitted to the outside and form an image of a subject on an imaging surface disposed outside, wherein at least one of the incident surface or the emission surface has a transmission effect and an internal reflection effect. In an optical prism consisting of optical surfaces to perform,
Optical surfaces such as the incident surface, the output surface, and the reflective surface related to the reflection are subjected to aluminum coating or multi-coating, and are defined differently from the optical surface on the same surface as one of these optical surfaces. An optical prism characterized in that a coating surface having a width of 1 mm or less is set at a boundary portion with the optical surface.

    [15] At least two opposing surfaces among the incident surface, the emission surface, and the reflection surface related to the reflection are formed so that the dimensions in the width direction intersecting the optical axis are substantially equal. 2. The optical prism as described in 1 above.

    [16] The optical surfaces such as the incident surface, the exit surface, and the reflective surface related to the reflection are formed as curved surfaces in which ridge lines formed by two adjacent surfaces are curved. 2. The optical prism as described in 1 above.

[17] At least three optical surfaces are provided, and incident light from an incident surface suitable for receiving light from an object is reflected twice or more inside itself to bend an optical path, and output from a predetermined emission surface as emitted light. The injection molding is performed on the side surface formed in a direction intersecting with each direction of the incident surface and the emission surface, and configured to form an image of a subject on an imaging surface disposed outside. A lens frame configured to be adapted to an optical prism formed with a projection for mounting a member formed using a slide mechanism applied to the law,
A mounting portion having a shape corresponding to the convex portion of the optical prism and a stepped portion formed on a predetermined surface of the optical surface such as the entrance surface, the exit surface, and the reflection surface related to the reflection is formed. Mirror frame characterized by being made.

[18] Provided with at least three optical surfaces, the incident light from the incident surface suitable for the incidence of light from the subject is reflected two or more times within itself to bend the optical path, and to be emitted from a predetermined emission surface The injection molding is performed on the side surface formed in a direction intersecting with each direction of the incident surface and the emission surface, and configured to form an image of a subject on an imaging surface disposed outside. An optical prism formed with a projection for attaching a member formed by using a slide mechanism applied to the law, and a predetermined shielding member formed so as to surround the periphery of the emission surface of the optical prism An optical assembly comprising a lens frame configured such that a portion can be fitted to the optical prism from its exit surface,
An optical assembly comprising a sealing and / or adhesive substance interposed between a predetermined inner surface of the shielding member of the lens frame and a predetermined outer surface of the optical prism corresponding to the predetermined inner surface. .

    [19] The optical assembly as described in 18 above, wherein the substance for sealing and / or bonding has an attribute of suppressing reflection of light.

[20] Provided with at least three optical surfaces, the incident light from the incident surface suitable for the incidence of light from the subject is reflected twice or more inside itself to bend the optical path, and as the emitted light from the predetermined emission surface The injection molding is performed on the side surface formed in a direction intersecting with each direction of the incident surface and the emission surface, and configured to form an image of a subject on an imaging surface disposed outside. Holds an optical prism formed with projections for attaching members formed using a slide mechanism applied to the method, and an image sensor that captures an image formed from the exit surface of the optical prism An optical assembly comprising a lens frame configured to fit the optical prism,
Shield that constitutes a substantially sealed space portion in cooperation with the imaging element held by the lens frame and the exit surface of the optical prism on at least one side of the lens frame side or the optical prism side An optical assembly comprising a member.

    [21] The optical assembly as described in 20 above, wherein the shielding member is provided on the optical prism side.

    [22] The optical assembly as described in 20 above, wherein the shielding member is provided on the lens frame side.

    [23] The shielding member is provided on both the optical prism side and the lens frame side, and the shielding members extending from both are joined by flange portions provided on the extending edges thereof. 21. The optical assembly as described in 20 above, wherein

[24] At least three optical surfaces are provided, the incident light from the incident surface suitable for the incidence of light from the subject is reflected twice or more inside itself, the optical path is bent, and the light is emitted from the predetermined emission surface. An optical prism configured to be emitted to the outside and form an image of a subject on an imaging surface disposed outside, wherein at least one of the incident surface or the emission surface has a transmission effect and an internal reflection effect. In an optical prism consisting of optical surfaces to perform,
The optical prism is used in combination with a lens frame configured to be adapted to itself, and is formed on a side surface formed in a direction crossing each direction of the incident surface and the exit surface. An optical prism, wherein a concave portion is formed so as not to obstruct an optical path within an effective diameter from the surface to the exit surface.

    [25] The optical prism as described in 24 above, wherein a convex portion protruding from the surface of the concave portion is provided at an appropriate position in the concave portion.

    [26] The convex portion includes a positioning portion for restricting the relative position between the frame member for holding the imaging element or the like disposed on the imaging surface and the optical prism. 26. The optical prism as described in 25 above.

[27] The convex portion has at least one or a plurality of plane portions, and a predetermined plane portion therein is substantially parallel or substantially parallel to the image sensor mounting surface formed on the frame member. 27. The optical prism as described in 26 above, which is vertical.

    [28] The positioning portion has a fitting convex portion or a fitting concave portion corresponding to the fitting concave portion or the fitting convex portion formed in the frame member, and the fitting convex portion or the fitting concave portion is 27. A protruding portion or a recessed portion for restricting the release of the fitting with the fitting concave portion or the fitting convex portion on the corresponding frame member side at least in a specific direction is formed. Optical prism.

    [29] The projecting portion or the recessed portion is formed as a dovetail portion or a dovetail portion corresponding to the dovetail portion or the dovetail portion as the fitting concave portion or the fitting convex portion formed in the frame member. 29. The optical prism as described in 28 above.

    [30] The positioning portion abuts against an elastic piece formed on the frame member so as to suppress a change in the relative position with respect to the positioning portion by an elastic force caused by its own elastic deformation. 29. The optical prism as described in 28 above, wherein a receiving surface adapted to receive force is formed.

[31] Provide at least three optical surfaces, reflect the incident light from the incident surface suitable for the incidence of light from the subject twice or more inside itself, bend the optical path, and output from the predetermined emission surface as the emitted light An optical prism configured to be emitted to the outside and form an image of a subject on an imaging surface disposed outside, wherein at least one of the incident surface or the emission surface has a transmission effect and an internal reflection effect. In an optical prism consisting of optical surfaces to perform,
The optical prism, wherein the incident surface, the exit surface, and the reflecting surface are each formed such that a substantially quadrilateral is formed by a ridge line around each of the surfaces.

[32] Provide at least three optical surfaces, bend the optical path by reflecting the incident light from the incident surface suitable for the incidence of light from the subject twice or more inside the self, and use it as the emitted light from the predetermined emission surface An optical prism configured to be emitted to the outside and form an image of a subject on an imaging surface disposed outside, wherein at least one of the incident surface or the emission surface has a transmission effect and an internal reflection effect. In an optical prism consisting of optical surfaces to perform,
An optical prism, wherein a lens frame or an image sensor mounting member is integrally formed outside the effective area of the exit surface.

    [33] Provide at least three optical surfaces, bend the optical path by reflecting the incident light from the incident surface suitable for the incidence of the light from the subject twice or more inside the self, An optical system in which an image of a subject is formed on an imaging surface disposed outside and is imaged on the outside, and a lens frame or an image sensor mounting member is integrally molded outside the effective area of the emission surface. A prism and an image pickup device for picking up an image formed by being emitted from the exit surface of the optical prism are directly attached to the attachment member of the optical prism via a lens frame or directly. Optical assembly.

[34] Provided with at least three optical surfaces, the incident light from the incident surface suitable for the incidence of light from the subject is reflected twice or more inside itself to bend the optical path, and output from the predetermined emission surface as the emitted light An optical system that includes two optical prisms that are output to the outside and at least one of the incident surface or the output surface has a transmission surface and an inner surface reflection function, and at least one of the optical prisms has image-forming properties. In the assembly,
At least one of the optical prisms has a convex portion or a concave portion for attaching the optical prism to a lens frame or another optical prism on a side surface formed in a direction intersecting with each direction of the incident surface and the emitting surface. An optical assembly formed by being formed.

[35] Provide at least three optical surfaces, bend the optical path by reflecting the incident light from the incident surface suitable for the incidence of light from the subject twice or more inside the self, and use it as the emitted light from the predetermined emission surface An optical system that includes two optical prisms that are output to the outside and at least one of the incident surface or the output surface has a transmission surface and an inner surface reflection function, and at least one of the optical prisms has image-forming properties. In the assembly,
At least one of the optical prisms is formed by integrally forming a lens frame or an image sensor mounting member outside an effective area of the exit surface or the entrance surface.

It is a figure which shows the external shape of the optical prism as one embodiment of this invention. It is a figure which shows one modification of embodiment described based on FIG. It is a figure which shows another modification of the optical prism demonstrated based on FIG. FIG. 10 is a perspective view of an optical prism as another modification of the optical prism described with reference to FIG. FIG. 6 is a perspective view of an optical prism as another modification of the optical prism described with reference to FIG. It is a figure for demonstrating the setting of the optical prism parting line demonstrated based on FIG. It is a figure for demonstrating the setting of the gate in the case of manufacturing the optical prism demonstrated based on FIG. 1, FIG. 6 with the injection molding method. It is a figure which shows the further another modification of the optical prism demonstrated based on FIG. It is a schematic diagram for demonstrating the characteristic which concerns on the external shape of the optical prism demonstrated based on FIG. It is a figure which shows the other form of the optical assembly demonstrated based on FIG. It is a figure which shows the further another form of the optical assembly demonstrated based on FIG. It is a figure which shows the further another form of the optical assembly demonstrated based on FIG. It is a typical sectional side view of the optical assembly formed by combining another type of imaging optical prism and a lens frame. It is a schematic diagram which shows the assembly state of the optical prism of FIG. 13, and the lens frame corresponding to this. It is a schematic diagram which shows another assembly state of the optical prism of FIG. 13, and the lens frame corresponding to this. It is a schematic diagram which shows another assembly state of the optical prism of FIG. 13, and the lens frame corresponding to this. It is a schematic diagram which shows another assembly state of the optical prism of FIG. 13, and the lens frame corresponding to this. It is a figure which shows other embodiment of this invention. It is a schematic diagram which shows the assembly state of the optical prism similar to the thing of FIG. 18, and the lens frame corresponding to this. It is a schematic diagram which shows the assembly state of the imaging optical prism of other embodiment of this invention, and the CCD board | substrate corresponding to this. It is a schematic diagram which shows the assembly state of the imaging optical prism of other embodiment of this invention, and the CCD board | substrate corresponding to this. It is a figure which shows the modification of FIG. It is a schematic diagram which shows the assembly state of the imaging optical prism of other embodiment of this invention, and the CCD board | substrate corresponding to this. It is a schematic diagram which shows the assembly state of the imaging optical prism of other embodiment of this invention, and the CCD board | substrate corresponding to this. It is a figure which shows the example of the imaging optical system using two optical prisms. It is a figure which shows embodiment using two optical prisms of this invention. FIG. 27 is a perspective view showing an example of a configuration in which a CCD is mechanically integrally attached to an integrated structure of two optical prisms as shown in FIG. 26. It is a side view which shows the other example of the attachment mechanism which attaches two optical prisms and CCD mechanically integrally. It is a side view which shows another example of the attachment mechanism which attaches two optical prisms and CCD mechanically integrally. It is a conceptual diagram of the structure which incorporated the optical assembly by this invention in the objective optical system of the imaging | photography part of an electronic camera. It is a conceptual diagram of the structure which incorporated the optical assembly by this invention in the objective optical system of the observation system of an electronic endoscope. It is a figure for demonstrating a desirable structure when arrange | positioning the optical prism of this invention ahead of image pick-up elements, such as CCD and a filter. It is a schematic diagram for demonstrating the metal mold | die with a slide mechanism. It is a schematic diagram for demonstrating the mechanism for moving the slide part of the metal mold | die with a slide mechanism.

Explanation of symbols

100, 101, 210, 220 ... Optical prisms 12, 13, 14, 15, 16, 17, 211, 212, 213, 214, 221, 222, 223, 224 ... Optical action surface 20 ... Low-pass filter 21 ... Imaging surface 22 ... Image sensor (CCD)
23 ... CCD substrate 23a ... mounting hole 23b ... mounting slot 30 ... lens frame 31L, 31R ... convex portion 60L, 60R ... side surface 70L, 70R ... concave portion 80L, 80R ... stepped portion 90L, 90R ... convex portion 91L, 91R ... boss 106L, 106R: Side surfaces 107L, 107R: Recessed portions 108L, 108R ... Stepped portions 109L, 109R ... Convex portions 131L, 131R ... Optical system mounting portions 132L, 132R ... Screw holes 133L, 133R ... Fitting grooves 134L, 134R ... Elastic piece portions 135L, 135R ... Square holes 150L, 150R ... Screws 161, 162 ... Column members 161a, 162b ... Pins 163, 163a ... Square columnar cylindrical member 163ap ... Stepped surface 164 ... Notches 165a, 165b ... Elastic pieces 166 ... Projections 167 ... For positioning Bank portion 168, 169, 170 ... Mirror frame 168a ... Opening 169L 169R ... Extension portions 170L, 170R ... Extension portions 170La, 170Rb ... Positioning step surfaces 190L, 190R ... Convex portion 202 ... Aperture 203 ... Image surface 205 ... Cover glass 231, 232 ... Mounting piece 233 ... Projection 234 ... Hole 235 ... Mounting bracket 236 ... L-shaped metal fitting 238 ... Bar-shaped spacer 239 ... Screw 237 ... Mounting metal fitting 240 ... Electronic camera 248 ... Shooting objective optical system 242 ... Shooting optical path 251 ... Filter 252 ... Processing means 259 ... Eyepiece optical system 260 ... Liquid crystal display element (LCD)
261 ... Recording means 262 ... Incident surface 263 ... Reflective surface 264 ... Reflective and refractive surface 265 ... Cover member 271 ... Electronic endoscope 272 ... Light source device 273 ... Video processor 274 ... Monitor 275 ... VTR deck 276 ... Video disc 277 ... Video printer 278 ... Insertion part 279 ... Tip part 286 ... Light guide fiber bundle 285 ... Illumination objective optical system 284 ... Cover member 280 ... Observation objective optical system 281 ... Filter 290 ... Mounting bracket E ... Observer eyeball C ... Imaging Image pickup surface P of element ... Eccentric prism D ... Symmetry surface of plane-symmetric free-form surface

Claims (3)

It has at least three optical surfaces and reflects the incident light from the incident surface suitable for the incident light from the subject twice or more inside itself, bends the optical path, and emits the light from the predetermined emitting surface to the outside as the emitted light An optical prism configured to form an image of a subject on an imaging surface disposed outside, wherein at least one of the entrance surface and the exit surface performs transmission and internal reflection In the optical prism consisting of
An optical prism, wherein a lens frame or an image sensor mounting member is integrally formed outside the effective area of the exit surface. It has at least three optical surfaces and reflects the incident light from the incident surface suitable for the incident light from the subject twice or more inside itself, bends the optical path, and emits it as the emitted light from the predetermined emitting surface to the outside An optical prism that is configured to form an image of a subject on an imaging surface disposed outside, and in which a lens frame or an imaging element mounting member is integrally formed outside the effective area of the emission surface; An optical assembly comprising: an imaging element attached to the mounting member of the optical prism, through a lens frame or directly, for capturing an image formed by being emitted from the exit surface of the optical prism. It has at least three optical surfaces and reflects the incident light from the incident surface suitable for the incident light from the subject twice or more inside itself, bends the optical path, and emits the light from the predetermined emitting surface to the outside as the emitted light An optical assembly in which at least one of the incident surface or the exit surface includes two optical prisms each having an optical surface that performs a transmission action and an inner surface reflection action, and at least one of the optical prisms has an imaging property.
At least one of the optical prisms is formed by integrally forming a lens frame or an image sensor mounting member outside an effective area of the exit surface or the entrance surface.

Images